Metso D201477

• Power Input: 24 VDC ±10, rated power consumption 11.2 W
• Pulse Input Channels: 8 isolated frequency measurement channels
• Input Frequency Range: 0 Hz ~ 100 kHz square wave pulse signal
• Input Signal Level Compatibility: 5 VDC / 24 VDC pulse signal auto-adaptive
• Signal Resolution: 32-bit pulse counting hardware counter per channel
• Backplane Bus: Metso proprietary ACN high-speed internal bus
• Operating Temperature Range: -20 °C ~ +60 °C
• Storage Temperature Range: -40 °C ~ +85 °C
• Humidity Tolerance: 5%–95% non-condensing
• Protection Grade: IP20 module body, IP54 full rack assembly
• Dimensions: 220 H × 160 W × 35 D mm
• Net Weight: 0.76 kg

Functional Features

1. 8 independent isolated pulse frequency measurement channels with dedicated hardware counters
2. Auto-adaptive 5 VDC / 24 VDC pulse signal input without manual jumper adjustment
3. Per-channel pulse signal loss fault detection and front panel LED alarm
4. Configurable pulse scaling factor for direct flow rate conversion calculation
5. Onboard non-volatile Flash memory stores flow meter calibration parameters
6. Full hot-swap compatible with ACN CS rack backplane
7. Hardware high-speed pulse capture without main controller calculation delay

Performance Parameters

• Frequency Measurement Accuracy: ±0.01 Hz full measurement range
• Channel Isolation Voltage: 1500 VAC channel to backplane bus
• Pulse Capture Response Time: ≤ 1 μs
• Surge Withstand Capacity: 2 kV ESD contact discharge, 4 kV EFT
• Vibration Resistance: 10–150 Hz, 1 g continuous operation
• Max Pulse Cable Length: 120 m shielded twisted pair cable

Material Composition

• PCB Substrate: FR4 high-Tg low-noise industrial fiberglass circuit board
• Pulse Signal Terminals: Gold-plated phosphor bronze anti-oxidation terminal blocks
• Counter Chip: Industrial grade 32-bit high-speed hardware counter IC
• Shield Frame: Single-layer cold-rolled steel pulse signal isolation shielding
• Mounting Frame: Black extruded aluminum alloy hard anodized anti-corrosion coating

Structural Characteristics

• Standard 1U dual-latch plug-in rack card structure
• Front panel 8-group independent LED pulse loss fault indicator array
• Rear gold finger connector docking with rack backplane bus
• Independent wiring terminal compartment for flow meter pulse signal cable access
• Isolation barrier separates high-frequency pulse circuit and digital backplane bus circuit

Working Principle

Advantage Highlights

1. Dedicated hardware counters eliminate main controller pulse calculation load
2. Auto-adaptive dual voltage pulse input compatible with all mainstream industrial flow meters
3. Ultra-high frequency capture capability supports high-flow-rate turbine meter measurement
4. Built-in flow scaling parameter storage eliminates repeated on-site calibration
5. Hot-swap maintenance without full rack power shutdown
6. Independent channel pulse loss fault alarm quickly locates faulty flow meter field equipment

Applicable Industries

• Petrochemical pipeline crude oil, chemical medium flow measurement
• Water treatment plant inlet/outlet flow monitoring
• Pulp mill white liquor, black liquor flow closed-loop control
• Mining process slurry flow meter pulse signal collection
• Natural gas pipeline station gas flow totalization monitoring

Installation Requirements

1. Install inside standard Metso ACN CS 8/16-slot control rack
2. Maintain 10 mm vertical ventilation gap between adjacent modules
3. Field pulse signal cables adopt double-shielded twisted pair wiring, single-point cabinet PE grounding
4. Cabinet PE grounding resistance ≤ 4 Ω to suppress high-frequency signal interference
5. Stabilize rack backplane 24 VDC power before hot-swapping modules
6. Cabinet internal continuous operating temperature controlled below 55 °C

Operation & Maintenance Precautions

1. ESD anti-static wrist strap mandatory during module disassembly and wiring
2. Separate pulse signal cables from high-power inverter wiring inside cabinet
3. Conduct quarterly inspection of terminal block screw tightness
4. Avoid installation adjacent to high-frequency high-power electrical equipment
5. Spare modules stored in sealed anti-static packaging with desiccant packs
6. Cut off field flow meter pulse wiring terminals before disassembling terminal blocks